Cosmological singularities and analytical solutions in varying vacuum cosmologies Spyros Basilakos, Andronikos Paliathanasis, John D. Barrow and G. Papagiannopoulos Eur. Phys. J. C, 78 8 (2018) 684 Published online: 27 August 2018 DOI: 10.1140/epjc/s10052-018-6139-8